List of improvements in Civ5

Tile improvements are buildings or installations constructed in terrain outside of cities, generally by Workers. Each improvement changes the properties of the tile where it's built, usually adding potential such as tile yields to it. Improvements are unlocked via certain technologies.

Improvements built on certain strategic and luxury resources are required for an empire to access the resources' special properties.

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With the exception of Great Tile Improvements, most improvements can be built by a Worker (or a Work Boat at sea), given the appropriate technology and provided that the tile meets the requirements. Improvements remove forests and jungles unless otherwise specified (notably the Trading Post and Camp). Building with a Worker requires several turns, while the Work Boat finishes the improvement instantaneously.

Improvements are susceptible to pillaging by enemies, including Barbarians. When any improvement is pillaged, it will be inactive until repaired by a Worker (including Great Tile Improvements).

Improvement yields, which include both relevant increases depending on the resource as well as bonuses from appropriate technologies such as Fertilizer, will be added to the base terrain yield combined with increased yields from the resource itself (yields provided when worked by a city).

There are some improvements only available to certain civilizations. And finally, there are certain improvements that can only be built by using Great People. This article lists all improvements in Civilization V.

These improvements are built by Great People, with the exception of the Landmark in Brave New World. All great tile improvements can be built on any passable land terrain type. With regards to resources, they will only connect any strategic resources on the tile. While they get additional bonus yield from technology, they do not get an increase from the type of strategic resource. They do not have any effect on luxuries nor bonus resources.

+100% DefenseDamages all enemy units that end their turn adjacent 33% of their Health Annexes all nearby tiles into your empire's territory when built (must be constructed on a tile in or bordering your own territory)

These improvements are only available to certain civilizations, but do not replace a generic one. Unique Improvements are not used to connect any resources (for example, a Brazilwood Camp may not be placed on Bananas).